From: "Tobin C. Harding" <tobin@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Tobin C. Harding" <tobin@kernel.org>,
Roman Gushchin <guro@fb.com>,
Alexander Viro <viro@ftp.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
Pekka Enberg <penberg@cs.helsinki.fi>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Christopher Lameter <cl@linux.com>,
Matthew Wilcox <willy@infradead.org>,
Miklos Szeredi <mszeredi@redhat.com>,
Andreas Dilger <adilger@dilger.ca>,
Waiman Long <longman@redhat.com>, Tycho Andersen <tycho@tycho.ws>,
"Theodore Ts'o" <tytso@mit.edu>, Andi Kleen <ak@linux.intel.com>,
David Chinner <david@fromorbit.com>,
Nick Piggin <npiggin@gmail.com>, Rik van Riel <riel@redhat.com>,
Hugh Dickins <hughd@google.com>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [RFC PATCH v2 13/14] dcache: Provide a dentry constructor
Date: Wed, 3 Apr 2019 15:21:26 +1100 [thread overview]
Message-ID: <20190403042127.18755-14-tobin@kernel.org> (raw)
In-Reply-To: <20190403042127.18755-1-tobin@kernel.org>
In order to support object migration on the dentry cache we need to have
a determined object state at all times. Without a constructor the object
would have a random state after allocation.
Provide a dentry constructor.
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
---
fs/dcache.c | 37 ++++++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 9 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index aac41adf4743..606844ad5171 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1603,6 +1603,22 @@ void d_invalidate(struct dentry *dentry)
}
EXPORT_SYMBOL(d_invalidate);
+static void dcache_ctor(void *p)
+{
+ struct dentry *dentry = p;
+
+ dentry->d_lockref.count = 0;
+ dentry->d_inode = NULL;
+
+ spin_lock_init(&dentry->d_lock);
+
+ INIT_HLIST_BL_NODE(&dentry->d_hash);
+ INIT_LIST_HEAD(&dentry->d_lru);
+ INIT_LIST_HEAD(&dentry->d_subdirs);
+ INIT_HLIST_NODE(&dentry->d_u.d_alias);
+ INIT_LIST_HEAD(&dentry->d_child);
+}
+
/**
* __d_alloc - allocate a dcache entry
* @sb: filesystem it will belong to
@@ -1658,7 +1674,7 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
dentry->d_lockref.count = 1;
dentry->d_flags = 0;
- spin_lock_init(&dentry->d_lock);
+
seqcount_init(&dentry->d_seq);
dentry->d_inode = NULL;
dentry->d_parent = dentry;
@@ -3091,14 +3107,17 @@ static void __init dcache_init_early(void)
static void __init dcache_init(void)
{
- /*
- * A constructor could be added for stable state like the lists,
- * but it is probably not worth it because of the cache nature
- * of the dcache.
- */
- dentry_cache = KMEM_CACHE_USERCOPY(dentry,
- SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
- d_iname);
+ slab_flags_t flags =
+ SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | SLAB_MEM_SPREAD | SLAB_ACCOUNT;
+
+ dentry_cache =
+ kmem_cache_create_usercopy("dentry",
+ sizeof(struct dentry),
+ __alignof__(struct dentry),
+ flags,
+ offsetof(struct dentry, d_iname),
+ sizeof_field(struct dentry, d_iname),
+ dcache_ctor);
/* Hash may have been set up in dcache_init_early */
if (!hashdist)
--
2.21.0
next prev parent reply other threads:[~2019-04-03 4:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 4:21 [RFC PATCH v2 00/14] Slab Movable Objects (SMO) Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 01/14] slub: Add isolate() and migrate() methods Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 02/14] tools/vm/slabinfo: Add support for -C and -M options Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 03/14] slub: Sort slab cache list Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 04/14] slub: Slab defrag core Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 05/14] tools/vm/slabinfo: Add remote node defrag ratio output Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 06/14] tools/vm/slabinfo: Add defrag_used_ratio output Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 07/14] tools/testing/slab: Add object migration test module Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 08/14] tools/testing/slab: Add object migration test suite Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 09/14] xarray: Implement migration function for objects Tobin C. Harding
2019-04-03 17:23 ` Matthew Wilcox
2019-04-03 21:19 ` Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 10/14] tools/testing/slab: Add XArray movable objects tests Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 11/14] slub: Enable moving objects to/from specific nodes Tobin C. Harding
2019-04-03 4:21 ` [RFC PATCH v2 12/14] slub: Enable balancing slabs across nodes Tobin C. Harding
2019-04-03 4:21 ` Tobin C. Harding [this message]
2019-04-03 4:21 ` [RFC PATCH v2 14/14] dcache: Implement object migration Tobin C. Harding
2019-04-03 17:08 ` Al Viro
2019-04-03 17:19 ` Al Viro
2019-04-03 17:48 ` Al Viro
2019-04-04 20:29 ` Tobin C. Harding
2019-04-04 21:58 ` Al Viro
2019-04-04 21:18 ` Tobin C. Harding
2019-04-03 17:56 ` Christopher Lameter
2019-04-03 18:24 ` Al Viro
2019-04-03 19:05 ` Al Viro
2019-04-04 8:01 ` Miklos Szeredi
2019-04-04 15:46 ` Christopher Lameter
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